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Near field and far field conversion method of multilayer grouping structure

A conversion method, near-far field technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of reducing transfer and multiplication operations, reducing algorithm complexity, and avoiding the use of positioning equipment

Active Publication Date: 2017-03-08
SHANGHAI RADIO EQUIP RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the retrieved domestic and foreign open and limited published literature, there is no fast algorithm based on multi-layer grouping structure for RCS near-far field conversion

Method used

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  • Near field and far field conversion method of multilayer grouping structure
  • Near field and far field conversion method of multilayer grouping structure
  • Near field and far field conversion method of multilayer grouping structure

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Experimental program
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Embodiment Construction

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0021] Calculation method principle of the present invention is as follows:

[0022] The multilayer plane wave expression between the target reflectivity pattern and the test near field is discretized into a matrix equation, and the near-far field conversion problem becomes a matrix equation inversion problem. For an electrically large target, the higher the order of the plane wave describing the near-field electromagnetic scattering characteristics of the target, the larger the number of samples. If the plane wave transfer is performed for each sampling point, the calculation of the matrix inversion problem will become very large. In order to reduce the complexity of the algorithm, the present invention uses a multi-layer grouping structure to accelerate the solution of integral equations.

[0023] Such as figure 1 Shown is the flow chart of the nea...

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Abstract

The invention relates to a near field and far field conversion method of a multilayer grouping structure. According to an addition theorem, near field scattering is decomposed by a multilayer plane wave, and a relational expression between a reflectivity spectrum and the near field scattering is obtained, wherein the relational expression can be discretized into a matrix equation. For an electrically large dimension target, the quantity of the unknown numbers of the above matrix equation is huge, a huge calculated amount and huge computer memory need to be consumed by direct solving or solving in an iterative way. Therefore, by use of the method disclosed by the invention, the addition theorem is utilized, a transfer operator is acted on the center of a high-hierarchy group, the plane wave is decomposed to the center of a next hierarchy group, and the process is carried out in a recursion way until last decomposition is acted on a sampling point. By use of the method, near field data which is on any position and is subjected to any polarization sampling can be processed, a near field test system is greatly simplified, and algorithm complexity and computer memory requirements can be effectively lowered and reduced.

Description

technical field [0001] The invention relates to the fields of target electromagnetic scattering and inverse scattering, in particular to the fast near-far field conversion technology of electromagnetic scattering. Background technique [0002] In recent years, the RCS (radar cross section) near-field test technology, which has been actively developed in recent years, refers to a test in the near-field that does not meet the far-field conditions, and then a combination of test and calculation technology to obtain the target RCS through near-far field conversion. When the electrical size of the target is large, the far-field conditions become extremely harsh and difficult to achieve in the experimental field. The near-field test only needs to be carried out in a limited experimental field with several times the target size, which is cheap and convenient. However, the near-field test needs to perform near-far field conversion processing on the test data to obtain the far-field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 贺新毅蔡昆林云王晓冰
Owner SHANGHAI RADIO EQUIP RES INST
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